I've just had the same problem because I had ipchains running --> try to
remove ipchains module, and then to "insmod" ip_tables and iptable_filter.
It worked just fine for me. And then ipt_LOG if you want some logs
(depending on your rules).

Is there any conflict with iptables and this kernel version ?

no, iptables is the packet filtering module for 2.4 kernels.

Romain
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